[JIT] - X64 - Peephole optimization to possibly skip emitting and reg, -1

[TIHan]

A minor change, it is similar to the work here -> #79630

The example:

        static uint Y(uint i)
        {
            return i & uint.MaxValue;
        }

The emitted and reg, -1 can be skipped if we know that the reg 's upper 32-bits are zero'ed and that the operation is 32-bits.

Overall, there are not that many improvements, but improvements nonetheless.

[ghost]

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Issue Details

---

A minor change, based off of #79630

The example:

        static uint Y(uint i)
        {
            return i & uint.MaxValue;
        }

Can be optimized to a cast:

Author:	TIHan
Assignees:	TIHan
Labels:	area-CodeGen-coreclr
Milestone:	-

[TIHan]

@dotnet/jit-contrib this is ready, pending CI, - @BruceForstall PTAL

[BruceForstall]

Diffs